@ Kynes
It was an example of stream processing.
The quincunx anti-aliasing method works better with some games than others. Usually I would prefer just edge blurring like used in top animation movies.
As to why "The Saboteur" developers are doing FSAA on the Cell and no AA at all on the Xenos in the XBox 360 version you will have to ask the developers for specifics. Probably it is performance related (tiling issues). Usually multi-platform titles are designed around the 360's strenghts and weaknesses (and thus sometimes difficult to port or make good use of the PS3 hardware), this may be one of those exceptions.